[PATCH bpf-next] bpf: fix register_btf_kfunc_id_set for !CONFIG_DEBUG_INFO_BTF

[Stanislav Fomichev <sdf@google.com>]

Commit dee872e124e8 ("bpf: Populate kfunc BTF ID sets in struct btf")
breaks loading of some modules when CONFIG_DEBUG_INFO_BTF is not set.
register_btf_kfunc_id_set returns -ENOENT to the callers when
there is no module btf. Let's return 0 (success) instead to let
those modules work in !CONFIG_DEBUG_INFO_BTF cases.

Cc: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Fixes: dee872e124e8 ("bpf: Populate kfunc BTF ID sets in struct btf")
Signed-off-by: Stanislav Fomichev <sdf@google.com>
---
 kernel/bpf/btf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 57f5fd5af2f9..24205c2d4f7e 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -6741,7 +6741,7 @@ int register_btf_kfunc_id_set(enum bpf_prog_type prog_type,
 
 	btf = btf_get_module_btf(kset->owner);
 	if (IS_ERR_OR_NULL(btf))
-		return btf ? PTR_ERR(btf) : -ENOENT;
+		return btf ? PTR_ERR(btf) : 0;
 
 	hook = bpf_prog_type_to_kfunc_hook(prog_type);
 	ret = btf_populate_kfunc_set(btf, hook, kset);
-- 
2.35.0.rc0.227.g00780c9af4-goog